[Rd] attach() outputs messages to stdout - should it be stderr?
hb at biostat.ucsf.edu
Mon Apr 7 17:20:27 CEST 2014
On Mon, Apr 7, 2014 at 1:40 AM, Martin Maechler
<maechler at stat.math.ethz.ch> wrote:
>>>>>> Henrik Bengtsson <hb at biostat.ucsf.edu>
>>>>>> on Sun, 6 Apr 2014 21:33:15 -0700 writes:
> > Contrary to other functions in 'base', attach() output
> > messages to stdout instead of stdout, e.g.
> >> a <- 1 capture.output(attach(list(a=1)))
> >  "The following object is masked _by_ .GlobalEnv:"
> >  ""
> >  " a"
> > Shouldn't this message go to stderr?
> well, it this is changed... it should be changed to use
> message() really -- as library() does.
> Then, it will not only go to stderr, but also be something you can
> e.g. use suppressMessages( . ) with.
> I tend to agree to change this from cat() to message(),
> and will do so after a bit of waiting..
Thanks - sounds good.
I proposed cat(..., file=stderr()) rather that message(), because I
saw it was used in several other place in 'base' - left overs from a
> > Here's a patch for the local function checkConflicts() of
> > base::attach(), cf. ditto for base::library() that outputs
> > to stderr:
>> Index: library/base/R/attach.R
>> --- library/base/R/attach.R (revision 65344)
>> +++ library/base/R/attach.R (working copy)
>> @@ -73,7 +73,7 @@
>> "The following objects
>> are masked %s %s:\n\n%s\n"),
>> if (i < db.pos) "_by_" else "from",
>> pkg, paste(objs, collapse="\n"))
>> - cat(msg)
>> + cat(msg, file = stderr())
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